Changes between Version 9 and Version 10 of Processing/RadiometricCalibration


Ignore:
Timestamp:
Dec 21, 2007 2:41:29 PM (11 years ago)
Author:
mggr
Comment:

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  • Processing/RadiometricCalibration

    v9 v10  
    3131= Specim =
    3232
    33 Calibration files are produced by Specim when they do maintenance on the instrument.
     33Calibration files are produced by Specim when they do maintenance on the instrument.  FSF is starting to do this now (first test attempt in Dec 2007).
     34
     35A brief description of the procedure:
     36 1. checking wavelength alignment (can be done in imaging mode - 512x?) - this checks that the light is being measured at the correct wavelengths (value unimportant)
     37   1. pick a suitable calibrated light source (e.g. big lamp) and flood out the CCD evenly
     38   1. examine the output to see if there are spikes (value unimportant, only position in spectrum counts) in the appropriate emission bands
     39   1. repeat with a filter and look for troughs (value unimportant, only position in spectrum counts) in the appropriate absorption bands
     40   1. this method can also be used to verify an existing calibration to some extent
     41 1. full calibration
     42   1. switch the instrument to calibration mode (1024x1024 pixels)
     43   1. point the instrument into a calibrated integrating sphere, at a distance where there won't be too many reflections back into the sphere, but close enough to evenly illuminate the whole CCD
     44   1. take measurements at the various settings
     45   1. (post processing) calculate offset and gain constants
    3446
    3547== Eagle ==